Optimal Shape Design of a Two-Dimensional Asymmetric Diffuser in Turbulent Flow

Abstract

An optimal shape of two-dimensional asymmetric diffuser in turbulent flow with maximum pressure recovery at the exit is numerically obtained using a mathematical theory. The Reynolds number based on the bulk mean velocity and the channel height at the diffuser entrance is 18,000 . The optimality condition for maximum pressure recovery is obtained to be zero skin friction along the diffuser wall. The turbulent flow inside the diffuser is predicted using the k - epsilon v(exp 2) - f model and optimal shapes are obtained through iterative procedures to satisfy the optimality condition for six different geometric constraints. For one of the optimal diffuser shapes obtained, large eddy simulation is carried out to validate the result of shape design.

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Document Details

Document Type
Technical Report
Publication Date
Apr 14, 2005
Accession Number
ADA447124

Entities

People

  • Haecheon Choi
  • Seokhyun Lim

Organizations

  • Seoul National University

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Boundary Layer
  • Boundary Layer Flow
  • Channel Flow
  • Computational Fluid Dynamics
  • Equations
  • Flow
  • Flow Separation
  • Fluid Dynamics
  • Fluid Flow
  • Geometry
  • Large Eddy Simulation
  • Pressure Distribution
  • Secondary Flow
  • Skin Friction
  • Turbulent Flow
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Fluid Dynamics.
  • Operations Research